A global view on star formation: The GLOSTAR Galactic plane survey VIII. Formaldehyde absorption in Cygnus X
文献类型：期刊论文
| 作者 | Gong, Y.16; Ortiz-Leon, G. N.15,16; Rugel, M. R.1,14,16; Menten, K. M.16; Brunthaler, A.16; Wyrowski, F.16; Henkel, C.12,13,16 ; Beuther, H.11; Dzib, S. A.10,16; Urquhart, J. S.2,9
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2023-10-13 |
| 卷号 | 678页码:A130 |
| 关键词 | ISM: clouds ISM: individual objects: Cygnus X ISM: kinematics and dynamics ISM: molecules ISM: structure |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202346102 |
| 产权排序 | 6 |
| 英文摘要 | Context. Cygnus X is one of the closest and most active high-mass star-forming regions in our Galaxy, making it one of the best laboratories for studying massive star formation. Aims. We aim to investigate the properties of molecular gas structures on different linear scales with the 4.8 GHz formaldehyde (H2CO) absorption line in Cygnus X. Methods. As part of the GLOSTAR Galactic plane survey, we performed large-scale (7 degrees x3 degrees) simultaneous H2CO (1(1,0)-1(1,1)) spectral line and radio continuum imaging observations toward Cygnus X at lambda similar to 6 cm with the Karl G. Jansky Very Large Array and the Effelsberg 100 m radio telescope. We used auxiliary HI, (CO)-C-13 (1-0), dust continuum, and dust polarization data for our analysis. Results. Our Effelsberg observations reveal widespread H2CO (1(1,0)-1(1,1)) absorption with a spatial extent of greater than or similar to 50 pc in Cygnus X for the first time. On large scales of 4.4 pc, the relative orientation between the local velocity gradient and the magnetic field tends to be more parallel at H-2 column densities of greater than or similar to 1.8x10(22) cm(-2). On the smaller scale of 0.17 pc, our VLA+Effelsberg combined data reveal H2CO (1(1,0)-1(1,1)) absorption only towards three bright HII regions. Our observations demonstrate that H2CO (1(1,0)-1(1,1)) is optically thin in general. The kinematic analysis supports the assertion that molecular clouds generally exhibit supersonic motions on scales of 0.17-4.4 pc. We show a non-negligible contribution of the cosmic microwave background radiation to the extended absorption features in Cygnus X. Our observations suggest that H2CO (1(1,0)-1(1,1)) can trace molecular gas with H-2 column densities of greater than or similar to 5 x 10(21) cm(-2) (i.e., A(V) greater than or similar to 5). The ortho-H2CO fractional abundance with respect to H-2 has a mean value of 7.0 x 10(-10). A comparison of the velocity dispersions on different linear scales suggests that the velocity dispersions of the dominant -3 km s(-1) velocity component in the prominent DR21 region are nearly identical on scales of 0.17-4.4 pc, which deviates from the expected behavior of classic turbulence. |
| WOS关键词 | H-II REGIONS ; YOUNG STELLAR OBJECTS ; 6 CM EMISSION ; MOLECULAR CLOUDS ; MAGNETIC-FIELDS ; RADIO-CONTINUUM ; PHYSICAL-PROPERTIES ; VELOCITY-GRADIENTS ; MASER EMISSION ; DARK CLOUDS |
| 资助项目 | European Research Council[CSF-648505] ; Deutsche Forschungsgemeinschaft in the Collaborative Research Center[SFB 881] ; NSFC[11988101] ; NSFC[NSFC 11973013] ; European Research Council (ERC) under the European Union[101018682] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001085750100002 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | European Research Council ; Deutsche Forschungsgemeinschaft in the Collaborative Research Center ; NSFC ; European Research Council (ERC) under the European Union |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5563]  |
| 专题 | 研究单元未命名 恒星形成与演化研究团组 |
| 通讯作者 | Gong, Y. |
| 作者单位 | 1.Natl Radio Astron Observ, 1003 Lopezville RD, Socorro, NM 87801 USA 2.Natl Radio Astron Observ, Cambridge, MA USA 3.Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac, France 4.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA 5.German Aerosp Ctr, Sci Informat, D-51147 Cologne, Germany 6.Indian Inst Space Sci & Technol, Dept Earth & Space Sci, Trivandrum 695547, India 7.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China 8.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100101, Peoples R China 9.Univ Kent, Ctr Astrophys & Planetary Sci, Canterbury CT2 7NH, England 10.IRAM, 300 Rue Piscine, F-38406 St Martin Dheres, France |
| 推荐引用方式 GB/T 7714 | Gong, Y.,Ortiz-Leon, G. N.,Rugel, M. R.,et al. A global view on star formation: The GLOSTAR Galactic plane survey VIII. Formaldehyde absorption in Cygnus X[J]. ASTRONOMY & ASTROPHYSICS,2023,678:A130. |
| APA | Gong, Y..,Ortiz-Leon, G. N..,Rugel, M. R..,Menten, K. M..,Brunthaler, A..,...&Cheema, A..(2023).A global view on star formation: The GLOSTAR Galactic plane survey VIII. Formaldehyde absorption in Cygnus X.ASTRONOMY & ASTROPHYSICS,678,A130. |
| MLA | Gong, Y.,et al."A global view on star formation: The GLOSTAR Galactic plane survey VIII. Formaldehyde absorption in Cygnus X".ASTRONOMY & ASTROPHYSICS 678(2023):A130. |
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